User Guide

8
Ultra Aire 120V Installation Instructions Ultra-Aire.com | [phone]
The recommended installation creates a separate return for the Ultra Aire 120V in a central area of the
structure. Duct the supply of the unit to the air supply of the existing HVAC system. Connect an insulated
duct from outside to the 6" damper of the Ultra Aire 120V to provide fresh make-up air.
DUCTING TO HVAC SYSTEMS
CAUTION!
DO NOT CONNECT WITH A STATIC PRESSURE GREATER THAN OR EQUAL TO +0.8 WG.
CONTACT TECHNICAL SUPPORT AT [phone] FOR ADDITIONAL DETAILS.
Ducting Considerations:
• All flexible ducting connected to the Ultra Aire 120V should be UL listed.
• A short piece of flexible ducting on all Ultra Aire 120V duct connections is recommended to reduce noise
and vibration transmitted to rigid ductwork in the structure.
• Use a minimum 8" (10" for inlet) diameter round or equivalent rectangular duct for total duct lengths of up
to 25'. Use a minimum 10" (12" for inlet) diameter round or equivalent rectangular duct for longer lengths.
• Grills or diffusers on the duct ends must not excessively restrict airflow.
• Effective dehumidification may require that ducting be branched to isolated, stagnant air flow areas. When
ducting to two or three areas, use 8" or larger diameter branch ducting. When ducting to four or more
areas, use 6" or larger diameter branch ducting. Provisions must be made to provide airflow from supply
locations to the central return location. Proper air distribution is important to ensure even humidity control
and heat distribution throughout the structure.
• DO NOT locate the return in a bathroom or a kitchen.
Backdraft
Damper
Air Handler Supply
Fresh Air Intake
(Optional)
Indoor
A
ir Return
Motorized
Damper
Duct Cover Plate
Ultra Series Supply
Recommended HVAC System Installation
• Install a dedicated return for the Ultra120V
from a central area of the structure.
•
•
Install an insulated duct from outside to the 6"
damper of the Ultra120V to provide fresh air
ventilation (optional).
The optional second supply of the Ultra120V
may be ducted to another location. This can
provide a second source of airflow to the
basement or supply of the existing HVAC
system with a backdraft damper.
• When using only one of the two supplies on the
Ultra120V, the unused supply must be blocked
using the duct cover plate included.
• DO NOT locate return in a bathroom or kitchen.
• Control should be located remotely from the
dehumidifier and placed in a central location.
Dedicated Ultra Series Return to HVAC Supply